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Biologist Liz and geologist Martin examine the link between the Rocky Mountains and the uranium found in the Atomic bomb.
Liz Bonnin and Martin Pepper investigate Mount Vesuvius near Naples, Italy and a nearby massive supervolcano, Campi Flegrei.
Martin Pepper and Liz Bonnin journey from the glaciers of Canada to the heat of Death Valley looking for evidence of Ice Ages in North America.